Thanks so much for the help every one! I really appreciate all the help you give me. Ok Battou, for your questions and I think you answered them. You even answered questions I didn't really ask but it helped. I was asking about the quality mostly and to see if anyone had any experience with one of these. You can better answer my other question if I tell you want I want the lens for, and I think you did answer it up there but I plan to go to the Redbull air races this year. I won't have the lens this year because I can't afford it, but I will be getting it about time for holidays next year, so the following summer I can have it for the Air races of that summer. Yes I know, planning far ahead, but thats me. Of course living in Indy, I have the Indianapolis Motor Speedway about 30 min from me so I go to the track a lot. I would like to get those race cars, and motorcycles. Primarily motor sports as well as wildlife from a far distance in sharp color and clarity! Does that sound like the lens for me?
I do have a 70-300mm lens but would like to get even closer to the subject. Besides the lens I have, EF 70-300mm f/4-5.6 IS USM, does not seem to take the pictures I would just love with sharpness at every zoom.
-Christopher